A pipe used as a speaking-tube or ear-trumpet. Obsolete.

An instrument to assist hearing, such as an ear trumpet. Cf. otacoustic, n.

An instrument to assist hearing; = otacousticon, n. Obsolete.

an ear trumpet.

An ear-trumpet. Obsolete.

A device or medicine used to improve hearing. Obsolete.

Any of various devices used to assist hearing or amplify sound. Also figurative. Cf. earlier otacousticon, n. Now rare.

= ear trumpet, n.

A trumpet-shaped device designed to be held to the ear in order to assist hearing.

Something of the nature of or resembling a trumpet. A similar apparatus for conveying sound to the ear of a partially deaf person: = ear trumpet, n.…

a mechanical or (later) electrical device to assist hearing.

A kind of ear-trumpet for the deaf.

An instrument which, pressed against the upper teeth, enables the deaf to hear more distinctly.

A type of hearing aid utilizing bone conduction of sound.

An instrument for recording and amplifying sound, which was designed to render sound audible to deaf persons.

a sound-amplifier for the hard of hearing.

a hearing aid.